Improvement in valve mechanisms for rock-drilling machines



Patented March 24, 1874.

1. wAnlN-GQ Valve Mechanisms for Rock-Drilling Machines.

JOHN e. wnnme, on New venir, n. Y.

IMPROVEMENT IN VALVE MECHANISIVIS FOR ROCK-DRILLING MACHINES.

Specification forming part of Letters Patent No. l49,0l3, dated March 24, 1874 application filed January 20, 1874. v

To all whom 'it may concern Be it known that I, J. B. WARING, of the city, county, and State of N ew York, have invented an Improved Valve Mechanism for `teck-Drilling Machines, of which the following is a specication:

My invention relates to rock-drilling machines in which the drill rod or plunger is operated by steam or compressed air; and the object of my invention is to operate the valve, on which depends the reciprocating action of the drill-rod, directly from the piston by simple mechanism, which will permit the free rotation of the said piston and of the drill-rod, which forms a part of the same-an object which I attain in the manner which I will now proceed to describe.

In the perspective view, Figure 1, of the accompanying drawing, A represents a portion of the cylinder of a rock-drilling machine, and midway, or thereabout, between the opposite ends of this cylinder are the depressed valveseats a and a, separated from each other by an opening, fr, extending from the faces of the valve through to the bore of the cylinder. In the valve-faces are two inlet-ports, b b, and two exhaust-ports, d d, the ports of one valve-face communicating' with one end of the cylinder, and those of the other face with the opposite end of the cylinder. The usual steam-chest for inclosing the valve and seats, and also the inlet and outlet passages, have been omitted in the drawing', for their character will be readily understood by those familiar with machinery of this class. A valve, B, of the duplex character, (best observed in the transverse section, Fig. 2,) is so constructed, so adapted to the seats and ports, and has such a reciproeating motion imparted to it as to direct steam or compressed air admitted to the chest, inclosing the valve, alternately to and exhaust it alternately from the opposite ends of the cylinder, in a manner which will be readily understood without explanation. The piston of this cylinder is illustrated in the perspective Kiew, Fig. 3, and consists of two collars, e e, formed on a rod, f, which passes through a stuffing-box in the cylinder-head, and which constitutes the drill-rod for receiving at its outer end the usual boring-tool. This piston must not only be at liberty to reciprocate freely in the cylinder, but must admit of being turn ed therein, as the requirements of the boring-tool demand, and the main aim of my invention is to permit the piston to be rotated freely, and at the same time to cause it to impart the desired transverse reciprocating motion to the valve. This is brought about mainly through the intervention of what may be termed a sleeve, D, a perspective view of which, as it appears when detached from the piston, is shown in Fig. 4, the sleeve being, in the present instance, made in two parts for ready adjustment to the rod f, to which it is fitted between the collars e e,l so that while it can have no longitudinal movement independently of the piston, the latter can turn freely in the sleeve, which has a cam-slot, w, for receiving a central lug, y, on the valve, as shown in Fig. 2.

It is essential, however, that the sleeve, in order that it may be an effective medium through which the piston actuates the valve, should be prevented from turning. rlhis is accomplished, in the present instance, by the frame G, (shown in the perspective view, Fig. 5,) and consisting of two parallel bars, h It, connected together by strips t z'. This frame is adapted to the cylinder, as shown in the plan view, Fig. 6, the bars h -t being fitted to the corners of the recessed valve-faces, and serving as guides for the valve, and the strips t' t' passing through the opening x in the cylinder, and projecting into longitudinal slots m m, formed in the sleeve, as shown in Fig. 4, so that the said strips prevent the sleeve from turning without interfering with its longitudin al movement.

It is not essential that the sleeve should entirely surround the piston-rodf between the collars e e. One half, D', Fig. 4., for instance, may be dispensed with, leaving the other portion or plate D to perform the duties explained above 5 but I prefer to use both portions, which, together, insure a more uniform wear of the piston.

In place of the cam-slot a groove or ways may be formed in the sleeve or its equivalent, for acting on the projection y of the valve.

The character of the differential or intermittent reciprocating movement of the valve will depend on the form of the slot or ways of the sleeve, and the movement of the valve may have to be changed in accordance with the character of the blow to be imparted by the drilling-tool, or in accordance with the point in the stroke Where it is desirable to cut off the steam or compressed air; hence I prefer, in all cases, to so make the sleeve that it can be readily removed to make Way for a diii'erent sleeve, as in the present instance.

I claim as my inventionl. The combination of the cylinder and piston of a rockdrilling` machine with the transverse valve, operated from Within the cylinder and from the piston through the medium of a cam slot or Ways adapted directly to the piston Within the said cylinder, all substantially as set forth.

2. The combination of a piston and a sleeve consisting,` of the two parts D D', substantially as described.

3. The frame G, adapted to the transverse valve, the cylinder, piston, and sleeve, as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

J OHN` E. WARING.

lVitnesses:

WM. A. STEEL, J. SHnRBonNE SINGER. 

